Reports:Tasks not implemented in R
From Rosetta Code
Awareness
If R is a language you like, or are interested in, please inform your fellow members of the R community; this page can't be emptied without your and their participation.
If R is a language you like, or are interested in, please inform your fellow members of the R community; this page can't be emptied without your and their participation.
Contents
Not implemented[edit]
These are currently not implemented in R. Please implement some if you can. If any tasks are not possible or too complex in R, they should not be on this list. To mark a task as such, add {{omit from|R}}, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.
A
- AVL tree
- Abbreviations, automatic
- Abbreviations, easy
- Abbreviations, simple
- Abstract type
- Active Directory/Connect
- Active Directory/Search for a user
- Active object
- Address of a variable
- Aliquot sequence classifications
- Angle difference between two bearings
- Animate a pendulum
- Anti-primes
- Append a record to the end of a text file
- Apply a digital filter (direct form II transposed)
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Arithmetic/Rational
- Arithmetic evaluation
- Atomic updates
- Averages/Mean angle
- Averages/Mean time of day
B
- Balanced ternary
- Best shuffle
- Binary digits
- Binary strings
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap/Bresenham's line algorithm
- Bitmap/Histogram
- Bitmap/Midpoint circle algorithm
- Bitmap/PPM conversion through a pipe
- Bitmap/Read a PPM file
- Bitmap/Read an image through a pipe
- Bitwise IO
- Box the compass
- Brace expansion
- Break OO privacy
- Bulls and cows/Player
C
- CSV to HTML translation
- CUSIP
- Calendar
- Calendar - for "REAL" programmers
- Call a foreign-language function
- Call an object method
- Canny edge detector
- Carmichael 3 strong pseudoprimes
- Casting out nines
- Catalan numbers/Pascal's triangle
- Catmull–Clark subdivision surface
- Chat server
- Checkpoint synchronization
- Chinese zodiac
- Church Numerals
- Circles of given radius through two points
- Color quantization
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Combinations with repetitions
- Comma quibbling
- Commatizing numbers
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Concurrent computing
- Conditional structures
- Conjugate transpose
- Constrained genericity
- Continued fraction
- Continued fraction/Arithmetic/Construct from rational number
- Convert seconds to compound duration
- Count in octal
- Count the coins
- Cramer's rule
- Create a file on magnetic tape
- Create an HTML table
- Create an object at a given address
- Cuban primes
- Currency
- Currying
- Cut a rectangle
D
- Deal cards for FreeCell
- Death Star
- Deconvolution/2D+
- Deepcopy
- Define a primitive data type
- Delegates
- Department Numbers
- Determinant and permanent
- Determine if only one instance is running
- Digital root/Multiplicative digital root
- Dijkstra's algorithm
- Dining philosophers
- Discordian date
- Distributed programming
- Doubly-linked list/Definition
- Doubly-linked list/Element definition
- Doubly-linked list/Element insertion
- Doubly-linked list/Traversal
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
- Dutch national flag problem
E
- EKG sequence convergence
- Eban numbers
- Echo server
- Eertree
- Egyptian division
- Egyptian fractions
- Elementary cellular automaton
- Emirp primes
- Empty directory
- Enforced immutability
- Entropy/Narcissist
- Equilibrium index
- Euler's identity
- Euler's sum of powers conjecture
- Events
- Execute Brain****
- Execute HQ9+
- Execute SNUSP
- Execute a Markov algorithm
- Exponentiation order
- Extensible prime generator
F
- FASTA format
- FTP
- Factorial base numbers indexing permutations of a collection
- Factors of a Mersenne number
- Farey sequence
- Fibonacci n-step number sequences
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- Find the intersection of two lines
- Find the last Sunday of each month
- Fixed length records
- Flipping bits game
- Flow-control structures
- Floyd's triangle
- Floyd-Warshall algorithm
- Forest fire
- Fork
- Formal power series
- Four bit adder
- Four is magic
- Four is the number of letters in the ...
- Fractran
- Function frequency
- Fusc sequence
G
H
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Handle a signal
- Harshad or Niven series
- Hash join
- Hello world/Line printer
- Hello world/Newbie
- Hello world/Web server
- Here document
- Hickerson series of almost integers
- Hilbert curve
- History variables
- Hofstadter Figure-Figure sequences
- Hofstadter Q sequence
- Holidays related to Easter
- Honeycombs
- Horizontal sundial calculations
- Hough transform
- Huffman coding
- Hunt The Wumpus
I
- IBAN
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Image convolution
- Image noise
- Imaginary base numbers
- Index finite lists of positive integers
- Inheritance/Multiple
- Integer overflow
- Inverted index
- Iterated digits squaring
K
L
- LZW compression
- Largest int from concatenated ints
- Largest number divisible by its digits
- Last letter-first letter
- Law of cosines - triples
- Left factorials
- Leonardo numbers
- Levenshtein distance
- Linear congruential generator
- Literals/Floating point
- Long primes
- Longest common subsequence
- Longest increasing subsequence
- Longest string challenge
- Loops/Increment loop index within loop body
- Loops/Wrong ranges
- Loops/with multiple ranges
- Lucky and even lucky numbers
- Ludic numbers
- Lychrel numbers
M
- MAC Vendor Lookup
- MD4
- MD5/Implementation
- Machine code
- Mad Libs
- Magic squares of doubly even order
- Magic squares of odd order
- Magic squares of singly even order
- Main step of GOST 28147-89
- Make directory path
- Map range
- Matrix chain multiplication
- Maximum triangle path sum
- Mayan numerals
- Maze generation
- Maze solving
- McNuggets Problem
- Median filter
- Memory layout of a data structure
- Metaprogramming
- Metered concurrency
- Metronome
- Mian-Chowla sequence
- Middle three digits
- Miller–Rabin primality test
- Minesweeper game
- Modular exponentiation
- Modular inverse
- Morse code
- Move-to-front algorithm
- Multi-dimensional array
- Multiplicative order
- Multisplit
- Munchausen numbers
- Munching squares
N
O
P
- Paraffins
- Parallel Brute Force
- Parallel calculations
- Parametric polymorphism
- Parametrized SQL statement
- Parse an IP Address
- Parsing/RPN calculator algorithm
- Parsing/RPN to infix conversion
- Parsing/Shunting-yard algorithm
- Partition an integer X into N primes
- Pascal's triangle/Puzzle
- Password generator
- Pathological floating point problems
- Pattern matching
- Peano curve
- Pentagram
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect totient numbers
- Permutations/Derangements
- Permutations/Rank of a permutation
- Permutations by swapping
- Pernicious numbers
- Phrase reversals
- Pi
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Pointers and references
- Poker hand analyser
- Polymorphic copy
- Polyspiral
- Population count
- Pragmatic directives
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Problem of Apollonius
- Pythagorean quadruples
- Pythagorean triples
R
- RCRPG
- RIPEMD-160
- RPG Attributes Generator
- RSA code
- Ramer-Douglas-Peucker line simplification
- Random number generator (device)
- Range consolidation
- Ranking methods
- Rate counter
- Read a configuration file
- Recaman's sequence
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Remove lines from a file
- Rendezvous
- Rep-string
- Resistor mesh
- Respond to an unknown method call
- Retrieve and search chat history
- Rock-paper-scissors
- Rosetta Code/Find bare lang tags
S
- S-Expressions
- SHA-1
- SHA-256
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Sailors, coconuts and a monkey problem
- Same Fringe
- Scope/Function names and labels
- Search a list of records
- Secure temporary file
- Self-describing numbers
- Self-referential sequence
- Semiprime
- Semordnilap
- Send an unknown method call
- Sequence of primes by trial division
- Sequence of primorial primes
- Set
- Set consolidation
- Set of real numbers
- Set puzzle
- Shoelace formula for polygonal area
- Shortest common supersequence
- Show Ascii table
- Sierpinski pentagon
- Simple database
- Singleton
- Singly-linked list/Element definition
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Smith numbers
- Sockets
- Sokoban
- Solve a Hidato puzzle
- Solve a Holy Knight's tour
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sort a list of object identifiers
- Sorting algorithms/Bead sort
- Sorting algorithms/Heapsort
- Sorting algorithms/Pancake sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Shell sort
- Sorting algorithms/Sleep sort
- Sorting algorithms/Strand sort
- Soundex
- Sparkline in unicode
- Special characters
- Special variables
- Speech synthesis
- Spelling of ordinal numbers
- Spinning rod animation/Text
- Split a character string based on change of character
- Square-free integers
- Square but not cube
- Stable marriage problem
- Start from a main routine
- State name puzzle
- Straddling checkerboard
- Stream Merge
- String append
- String interpolation (included)
- String matching
- String prepend
- Strip a set of characters from a string
- Strip block comments
- Strip control codes and extended characters from a string
- Strip whitespace from a string/Top and tail
- Strong and weak primes
- Subleq
- Substring/Top and tail
- Subtractive generator
- Sudoku
- Suffixation of decimal numbers
- Sum and Product Puzzle
- Sum to 100
- Superellipse
- Superpermutation minimisation
- Sutherland-Hodgman polygon clipping
- Synchronous concurrency
T
- Table creation/Postal addresses
- Taxicab numbers
- Temperature conversion
- Terminal control/Clear the screen
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- Terminal control/Display an extended character
- Terminal control/Hiding the cursor
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Ternary logic
- Test integerness
- Textonyms
- The ISAAC Cipher
- The Name Game
- The Twelve Days of Christmas
- Thiele's interpolation formula
- Thue-Morse
- Tic-tac-toe
- Tokenize a string with escaping
- Topic variable
- Total circles area
- Totient function
- Tree traversal
- Truncatable primes
- Truncate a file
- Truth table
- Twelve statements
U
V
W
Draft tasks without implementation[edit]
These tasks as drafts, meaning they largely need more work to turn them into full tasks. Perhaps you can help by trying to implement them in R (after all, one of the key requirements for a task being non-draft is multiple implementations, preferably in widely different languages) but be aware that this may be difficult because of lack of definition of the task itself.
2
A
B
C
- Cantor set
- Card shuffles
- Chaocipher
- Chebyshev coefficients
- Check input device is a terminal
- Check output device is a terminal
- Chemical Calculator
- Cheryl's Birthday
- Chess player
- Chess player/Move generation
- Chess player/Program options and user interface
- Chess player/Search and evaluation
- Chowla numbers
- Cipolla's algorithm
- Code segment unload
- Color wheel
- Combinations with repetitions/Square Digit Chain
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N)
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N1, Contined Fraction N2)
- Convex hull
- Copy stdin to stdout
- Create an object/Native demonstration
- Curve that touches three points
- Cycle detection
D
E
F
- Faulhaber's formula
- Faulhaber's triangle
- Feigenbaum constant calculation
- Fibonacci heap
- File extension is in extensions list
- File size distribution
- Find URI in text
- Find duplicate files
- Find first and last set bit of a long integer
- Find the intersection of a line with a plane
- Finite state machine
- Free polyominoes enumeration
- French Republican calendar
- Functional coverage tree
G
H
I
L
M
- Magic 8-Ball
- Make a backup file
- Markov chain text generator
- Mastermind
- Matrix Digital Rain
- Mayan calendar
- Mersenne primes
- Modular arithmetic
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Multiline shebang
N
O
P
R
- Railway circuit
- Ramsey's theorem
- Read a file character by character/UTF8
- Readline interface
- Recursive descent parser generator
- Reflection/List methods
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance Calculator
- Reverse the gender of a string
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Run examples
- Rosetta Code/Tasks sorted by average lines of code
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- Safe mode
- Sattolo cycle
- Selective File Copy
- Self-hosting compiler
- Separate the house number from the street name
- Sexy primes
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Snake
- Snake And Ladder
- Solve a Rubik's Cube
- Solving coin problems
- Sort numbers lexicographically
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Cycle sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Starting a web browser
- Subset sum problem
- Substitution Cipher
- Suffix tree
T
- Table creation
- Tamagotchi emulator
- Tarjan
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text between
- Text to HTML
- Time-based One-time Password Algorithm
- Tonelli-Shanks algorithm
- Topological sort/Extracted top item
- Transportation problem
- Two Sum
- Type detection
U
W
Requiring Attention[edit]
Examples[edit]
These tasks have implementations in R, but somebody, somewhere, decided that the example implementation was faulty or in some other way requiring attention. If you're familiar with the task and language, please consider reviewing/correcting the example and removing the notice.
Other pages[edit]
These are other pages related to R which require attention; with your knowledge and assistance, we can improve the quality of the site's content.
No pages found.
Not Considered[edit]
These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that R was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.
End of List[edit]
Again, feel free to try your hand at any of the tasks listed on this page.
